General code cleanup

Even if some elements are not changed during the 3.0.x branch rework, some code cleanup and improvements can occur.

• field widget
• field formatters
• file upload form
• folder creation form
• query page
• Routing: Uniformize document_id, object_id and object for example
• UI strings: #3167434: Interface strings needs to be reworked
• no more render()
• Have routes working with or without JS